crypto/acompress.c

   1 /*
   2  * Asynchronous Compression operations
   3  *
   4  * Copyright (c) 2016, Intel Corporation
   5  * Authors: Weigang Li <weigang.li@intel.com>
   6  *          Giovanni Cabiddu <giovanni.cabiddu@intel.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the Free
  10  * Software Foundation; either version 2 of the License, or (at your option)
  11  * any later version.
  12  *
  13  */
  14 #include <linux/errno.h>
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/seq_file.h>
  18 #include <linux/slab.h>
  19 #include <linux/string.h>
  20 #include <linux/crypto.h>
  21 #include <crypto/algapi.h>
  22 #include <linux/cryptouser.h>
  23 #include <linux/compiler.h>
  24 #include <net/netlink.h>
  25 #include <crypto/internal/acompress.h>
  26 #include <crypto/internal/scompress.h>
  27 #include "internal.h"
  28
  29 static const struct crypto_type crypto_acomp_type;
  30
  31 #ifdef CONFIG_NET
  32 static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
  33 {
  34         struct crypto_report_acomp racomp;
  35
  36         strncpy(racomp.type, "acomp", sizeof(racomp.type));
  37
  38         if (nla_put(skb, CRYPTOCFGA_REPORT_ACOMP,
  39                     sizeof(struct crypto_report_acomp), &racomp))
  40                 goto nla_put_failure;
  41         return 0;
  42
  43 nla_put_failure:
  44         return -EMSGSIZE;
  45 }
  46 #else
  47 static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
  48 {
  49         return -ENOSYS;
  50 }
  51 #endif
  52
  53 static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
  54         __maybe_unused;
  55
  56 static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
  57 {
  58         seq_puts(m, "type         : acomp\n");
  59 }
  60
  61 static void crypto_acomp_exit_tfm(struct crypto_tfm *tfm)
  62 {
  63         struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
  64         struct acomp_alg *alg = crypto_acomp_alg(acomp);
  65
  66         alg->exit(acomp);
  67 }
  68
  69 static int crypto_acomp_init_tfm(struct crypto_tfm *tfm)
  70 {
  71         struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
  72         struct acomp_alg *alg = crypto_acomp_alg(acomp);
  73
  74         if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
  75                 return crypto_init_scomp_ops_async(tfm);
  76
  77         acomp->compress = alg->compress;
  78         acomp->decompress = alg->decompress;
  79         acomp->dst_free = alg->dst_free;
  80         acomp->reqsize = alg->reqsize;
  81
  82         if (alg->exit)
  83                 acomp->base.exit = crypto_acomp_exit_tfm;
  84
  85         if (alg->init)
  86                 return alg->init(acomp);
  87
  88         return 0;
  89 }
  90
  91 static unsigned int crypto_acomp_extsize(struct crypto_alg *alg)
  92 {
  93         int extsize = crypto_alg_extsize(alg);
  94
  95         if (alg->cra_type != &crypto_acomp_type)
  96                 extsize += sizeof(struct crypto_scomp *);
  97
  98         return extsize;
  99 }
 100
 101 static const struct crypto_type crypto_acomp_type = {
 102         .extsize = crypto_acomp_extsize,
 103         .init_tfm = crypto_acomp_init_tfm,
 104 #ifdef CONFIG_PROC_FS
 105         .show = crypto_acomp_show,
 106 #endif
 107         .report = crypto_acomp_report,
 108         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
 109         .maskset = CRYPTO_ALG_TYPE_ACOMPRESS_MASK,
 110         .type = CRYPTO_ALG_TYPE_ACOMPRESS,
 111         .tfmsize = offsetof(struct crypto_acomp, base),
 112 };
 113
 114 struct crypto_acomp *crypto_alloc_acomp(const char *alg_name, u32 type,
 115                                         u32 mask)
 116 {
 117         return crypto_alloc_tfm(alg_name, &crypto_acomp_type, type, mask);
 118 }
 119 EXPORT_SYMBOL_GPL(crypto_alloc_acomp);
 120
 121 struct acomp_req *acomp_request_alloc(struct crypto_acomp *acomp)
 122 {
 123         struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
 124         struct acomp_req *req;
 125
 126         req = __acomp_request_alloc(acomp);
 127         if (req && (tfm->__crt_alg->cra_type != &crypto_acomp_type))
 128                 return crypto_acomp_scomp_alloc_ctx(req);
 129
 130         return req;
 131 }
 132 EXPORT_SYMBOL_GPL(acomp_request_alloc);
 133
 134 void acomp_request_free(struct acomp_req *req)
 135 {
 136         struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
 137         struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
 138
 139         if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
 140                 crypto_acomp_scomp_free_ctx(req);
 141
 142         if (req->flags & CRYPTO_ACOMP_ALLOC_OUTPUT) {
 143                 acomp->dst_free(req->dst);
 144                 req->dst = NULL;
 145         }
 146
 147         __acomp_request_free(req);
 148 }
 149 EXPORT_SYMBOL_GPL(acomp_request_free);
 150
 151 int crypto_register_acomp(struct acomp_alg *alg)
 152 {
 153         struct crypto_alg *base = &alg->base;
 154
 155         base->cra_type = &crypto_acomp_type;
 156         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
 157         base->cra_flags |= CRYPTO_ALG_TYPE_ACOMPRESS;
 158
 159         return crypto_register_alg(base);
 160 }
 161 EXPORT_SYMBOL_GPL(crypto_register_acomp);
 162
 163 int crypto_unregister_acomp(struct acomp_alg *alg)
 164 {
 165         return crypto_unregister_alg(&alg->base);
 166 }
 167 EXPORT_SYMBOL_GPL(crypto_unregister_acomp);
 168
 169 MODULE_LICENSE("GPL");
 170 MODULE_DESCRIPTION("Asynchronous compression type");